Abstract: Method for automatic processing of well logging information in order to determine the clay parameters, the clay content and to calibrate the porosity and density measurement tools.Among the parameters varying as a function of the presence of clay, at least two indicators are selected. The borehole is divided into intervals and in each one is determined the most argilaceous level and the least argilaceous level and the totality of these points is used to calculate the clay parameters and the clay content.One application is the determination of oil-bearing strata.

Abstract: In accordance with illustrative embodiments of the present invention, methods for processing well logging data comprise deriving measurements of a plurality of earth formation parameters and combining these measurements in a new manner to enable interpretation of shales and shaly sand type formations. More particularly, measurements of a plurality of the hydrogen index, bulk density, radially deep and shallow resistivity, spontaneous potential, acoustic travel time and natural formation radioactivity content are made and combined in a manner to produce data useful in evaluating shales and shaly sand type formations.